Improvement in heating-stoves



3 Sheets--Sheet 2. H E N RY ZAH N.

Improvement in Heating Stoves. N0. '121,741, Patented Dec.12,18471`.

3 Sheets--Sheet 3. H E N RY ZAH N hnprovementin Heang Stove&

No. 121,741. Patented Dec. 12, 3871.

Witnesses [n1/14.5771

AM #Harm/mauvais cn. mf asso/mtl: more@ PATENT OFFICE.

HENRY ZAHN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN HEATING-STOVES.

Specification forming part of Letters Patent No. 121,741, dated December12, 1871.

. To all whom t may concern:

Beit known that I, HENRY ZAHN, of the city and county of Philadelphia,in the State of Pennsylvania, have invented a new and useful Improvementin Furnaces and Stoves; and I do hereby declare the following to be afull, clear, and exact description thereof, which will enable othersskilled in the art to which it appertains to make and use myimprovement, reference being had to the accompanying drawing which formsa part of this speciiication, and in which- Figure 1, Sheet l, is avertical section of my improvement; Fig. 2, Sheet 2, a vertical sectionof a modification thereof; and Fig. 3, Sheet 3, a side elevation of thelast-named modification.

The same parts are denoted by the same letters in all the figures.

The nature of this invention consists in the arrangement hereinafterdescribed of the parts of a stove or furnace whereby steam and air maybe so admitted to the fire as to complete the combustion ofthe fuel.

A in the drawing represents the fire-chamber, upon the grate B of whichthe fire is made. C is the ash-grate, and D the ash-pan. E E areair-chambers, to which air is admitted through the apertures e e, andfrom which it escapes by the apertures ff. F F are boilers, providedwith pipes G Gr, H H, and I I. G is a feedpipe, through which the boileris filled with water. H is a steam-pipe opening into the conduit J and Iis a steam-pipe opening under the liregrate. There may be several ofthese pipes H and I attached to each boiler, and the pipes I may eitherterminate immediately under the grate-bars, as shown on the left-handside of Fig. l, or be carried up to the height of the firechambers andperforated, as shown on the righthand side thereof'. The pipes H and Imay, if desired, be constructed with stop-cocks to regulate thesteam-jets. The upper part of the conduits J J is curved, as shown inFig. l, so as nearly to correspond with the curve ofthe dome K, and theconduits open below the throat L of the furnace. M M are slides,connected to arms N N, so that by turning these arms (through theintervention of rods or in any convenient manner) the slides may beadjusted to open or close the throat L, and increase or diminish thedraught, as may be desired. P I are apertures for the admission of air,one of which is higher than the other. R is the radiator, and S thesmoke-pipe opening. into the chimney.

ln the operation of this furnace, when steam has been generated in theboilers a jet escapes from each of the pipes I I into the fire, therebyintensifying the combustion. Another jet of steam escapes from each ofthe pipes H H and issues from the conduit J, intensifying the combustionin the upper part of the nre-chamber. The steam issuing from theconduits tends to drive the products of combustion down into the fire.The air which enters through the apertures P P contributes to thiseffect, driving both steam and products of combustion downward, and bymaking one of these apertures higher than the other the upper enteringdraught of cold air is caused to press on the lower draught, increasingthe weight and force of the column by which the unconsumed products arereturned to the ire to undergo more thorough combustion.

In the modification shown in Figs. 2 and 3 I dispense with the boilers Fand construct the inner walls of the airchambers E with perforations ce', through which the entering air passes under the grate-bars andupward into the iire. The air also passes up through the apertures ffinto the conduits J J and mixes with the lire and products ofcombustion, thereby rendering the combustion more complete. Upon thedome I place a pan or boiler, T, constructed with perforations t t. Theapertures I I) may be on the same level and are provided with slidingcovers U U, which may, if desired, be connected to a single handle, V,so that both apertures may be opened or closed simultaneously. The steamin this case issues from the perforations t, and, mixing with thedraught of air, enters the throat of the furnace, where it not onlyforces the products of combustion down into the fire, but intensiiiesthe combustion by supplying additional oxygen.

I do not confine my claim to the details of construction above shown anddescribed, as they may obviouslyY be varied without affecting theoperation of the furnace. For example, the fan T, instead of beingconstructed as shown in Fig. 3, may extend completely around thefurnace, and the boiler F may be constructed in like manner. The throatof the furnace may be round or polygonal, and may be made with anydesired number of apertures or perforations, and these closed and openedby a slide or other suitable l means. j

l\l,\'111\'e11tio11 111:1)- be applied to all sortsot'1'111- 1 Ilaees7stoves. ranges. heaters. boilers t'or 111ari11e, stationary, orlocomotive engines, &e.

ItA desired, stea111 111:1.1 he admitted from the pau or boiler i11to aroo111 so as to render the atmosphere 111oist. t

'hat', I elai111 as new, and desire to secure by t Letters Patent ot'thtl I'nited States, isl 1. The apertures l l, arranged one above theother, aud operating as described.

2. The arrangement of the radiator inilnedii ately above the throat ofthe furnace. j

HENR Y ZAHJ.

